Fluke DSP-100 User Manual page 174

DSP-100/2000
Users Manual
Link Pulse
A single-bit, 100 ns test pulse that is transmitted at least every 50 ms during idle periods
on 10BaseT link segments to verify link integrity.
Near-End Crosstalk (NEXT)
The amount of coupling loss (in decibels) occurring when a signal sent on one cable pair
is received as crosstalk by another cable pair. Higher NEXT levels correspond to better
cable performance.
NVP
Nominal Velocity of Propagation. The speed of a signal through a cable, expressed as a
percentage of the speed of light. Typically, the speed of a signal through a cable is
between 60% and 80% of the speed of light.
Packet
A group of bits in a specific format, containing a data message that is sent over a network.
Plenum Cable
Cable certified for installation in air ducts and open spaces over suspended ceilings
without conduit. Plenum cable is fire resistant and does not emit toxic fumes when burned.
Propagation Delay
The time required for an electrical signal to travel the length of a cable.
PSNEXT
Power-sum NEXT. The combined NEXT received by a cable pair from the other pairs.
Resistor
An electronic component that resists the flow of electrical current. Resistors are used in
the terminators that are connected to the ends of coaxial cable.
Return Loss (RL)
The loss of signal strength in a cable due to signal reflections. A cable's RL value
indicates how well the cable's characteristic impedance matches its rated impedance over
a range of frequencies.
B-6